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@@ -1236,6 +1236,104 @@ You can also refresh the page to abandon this and any other changes made locally
 
 Until the work order is saved the items are not actually deleted.
 
+### Expenses
+
+![Work order item expenses](img/svc-wo-expenses.png)
+
+The Work order item Expenses record is where you enter any miscellaneious expenses required to provide service.
+
+Typically these are items that a service technician needs to purchase locally when providing on-site service to a remote location or any expense that is not tracked in inventory.
+
+The Expenses section of a work order is **optional** and won't be displayed until a work order item expense record is added from the [Work order Items context menu](#work-order-item-context-menu).
+
+It can also be completely removed as an option if it won't be required by [customizing](ay-customize.md) the work order form and un-checking the _Visible_ checkbox in the `Work order Item.Expenses` customization box.
+
+If more than one expense record is added to the work order item they will be displayed in a table with an edit form below. Selecting a row in the table will switch the edit form below to the row selected.
+
+A work order item can have zero to many separate Work order item expense records as required.
+
+All Work order item expense edit form fields here are **optional** but the currency fields must at least have a zero in them.
+
+#### Summary
+
+Text field describing the expense. Text entered here appears on stock work order and invoice reports as the explanation of the expense required.
+
+#### Total Cost
+
+The currency amount of the pre-tax cost of this expense item for internal tracking purposes, this is not displayed in stock Customer facing work order reports.
+
+#### Charge amount
+
+The amount to charge the Customer for this expense. Displays on the stock work order reports.
+
+#### Charge to customer
+
+Checking this box includes this expense in stock work order reports intended for Customers and is used in calculations for Customer charges.
+
+#### Tax paid
+
+Any taxes paid for this expense.
+
+#### Charge Tax Code
+
+[Tax code](acc-tax-codes.md) used to calculate charges to the Customer for this expense.
+
+#### Reimburse User
+
+Select if User should be re-imbursed for this expense (i.e. they paid for it out of pocket). Doesn't trigger anything in AyaNova; used on reports and for general tracking purposes.
+
+#### User
+
+The User who required this expense and paid for it.
+
+#### Description
+
+This optional field is used to record additional details of the expense required.
+
+#### Tax A amount
+
+Charge amount multiplied by the selected Tax's A percentage.
+
+#### Tax B amount
+
+If the selected Tax does not have a Tax B set this field will be zero.
+
+If the selected Tax has Tax on Tax checked then this value is (Charge amount + Tax A amount) multiplied by Tax's B percentage.
+
+If Tax on Tax is not set then this is Charge amount multiplied by the selected Tax's B percentage.
+
+#### Line total
+
+Charge amount + Tax A amount + Tax B amount.
+
+### Expense context menu
+
+![Work order item expense context menu](img/svc-wo-expenses-context-menu.png)
+
+#### New
+
+Add a new work order item Expense record to the collection and open it's record in the edit form.
+
+#### Mark for deletion
+
+Flag the selected row work order item expense record to be permanently deleted.
+
+When clicked the work order item expense record selected will display in the table with a line through it indicating it will deleted on the next save of the work order and an _Undelete_ button for reversing the delete flag will appear at the top of this work order item expense's edit form.
+
+You can also refresh the page to abandon this and any other changes made locally to the work order that have not yet been saved at the server.
+
+Until the work order is saved it's not actually deleted.
+
+#### Mark ALL for deletion
+
+Flag all work order item expenses, in this work order item only, to be permanently deleted when the work order is saved.
+
+When clicked, all the work order item expenses on this work order item will display in the table with lines through them indicating they will be deleted on the next save of the work order and an _Undelete_ button for reversing the delete flag will appear at the top of each work order item expense's edit forms.
+
+You can also refresh the page to abandon this and any other changes made locally to the work order that have not yet been saved at the server.
+
+Until the work order is saved the items are not actually deleted.
+
 ### Loans
 
 ![Work order item loans](img/svc-wo-loans.png)